Electric lifting jack



J. A. ANGLADA. ELECTRIC LiFTlNG JACK.

APPL|CAT|0N-FILED)UWM-.1919.

Patented May 2, 1922.

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ATTORNEY 3 SHEETS-SHEET 2.

ATTORNEY A. ANGLADA.

ELECTRIC LIFTING JACK.

APPLICATION FILED IuLY I4. I9I9.

Patented May 2, 1922.

FIGA 5 GI. F

J. A. ANGLADA.

ELECTRIC LIFTING JACK.

APPucATloN FILED 1uLY14. 1919.

FIG.

f llllllhlll l' \\i jilll /A/l/E/VTOR ATTORNEY Patented May 2, 1922.

rarslrr OFFICE. y

OF. JE1\`I'KIN TOWN, PENNSYLVANIA, ASSIGNOR 0F ONE-:HALF T0 CHARLES S.ACKLEY, OF NEW YORK, N. Y.

ELECTRIC LIFTIN'G- JACK.

Application mea July 14,

To all whom t may concern:

Be it known that I, JOSEPH A. ANGLADA, a citizen of the United States,and a resident of Jenkintown, county of Montgomery, and State ofPennsylvania, have invented certain new and useful Improvements inElectric Lifting Jacks, of which the following., together with theaccompanying drawings, is a specification.

My invention relates to lifting jacks actuated by electric motors andmore particularly to light portable jacks such as may be used forlifting automobiles, and its object is to provide a simple, inexpensiveand elicient device of this character. lAnother object is to provide asa part of the device, a handle by means of which it may be positionedand its motor controlled. Another object is to providean arrangement forautomatically stopping the motor when the lifting element of the jackreaches the' ends of its travel. l

These and other. objects of the invention will ap ear in thefollowingspecification in which Ii will describe the invention, thenovel features of which will be set forth in appended claims. l

Referring 'to the drawings:

Figure l is a side elevation of a lifting jack which is made accordingto and embodies this invention with the positioning and control handleremoved.

Figure 2 is a plan view of the same device.

' Figure 3 isa sectional end elevation of the form of jack shown inFigures 1 and 2, the section being tak'en on the line 3-3 of Figvre 2. A

Figure 4 is a side elevation of another form of construction which alsoembodies this invention.4 t

Figure '5- is a plan view of the device shown in Figure 4.

Figure 6 is a sectional end elevation of the jack of Figures 4 and 5,the section being taken on the line 6-6 of Figure 5.

Figure 7 is a sectional side elevation of the lower end of a positioningand control handle' together with its operating parts, Y

the section being taken on the line 7-7 of Figure 8.' l

Figure 8 isa plan view of the parts shown in Figure 7:

Figure 9 is a sectional end elevation of the lower end of anothery formof positioning Specification of Lettersrlatent.

Patented vMay 2, 1922. 1919. serial iro. 310,652.

and control handle and its cooperating parts.

.The section in this figure is taken on the line 9-9 of Figure 10.

Figure 10 is a plan view of the parts shown in Figure 9. Y y

Figure 11 isa sectional elevation 0n a larger scale of a part of thelifting screw and the parts which cooperate therewith to limit itsmovement.

Figure 12 is a wiring diagram showing a way in which the 'parts may beconnected electrically.

Like characters of reference designate corresponding parts in all of theiigures of the drawings. v v

2O designates a base upon which the various parts Iare mounted. 21 is anouter casing secured to the base by a collar 22. Rotatively supportedwithin the casing is a hollow driving member 23, the lower end of whichrests upon an anti-friction 4bearing 24. The upper part of this memberis constructed to form internal threads 25 through which passes thelifting screw 26. This screw is provided with a longitudinal groove 27in which key 28 in the upper part of the casing 21 fits to prevent therotation of the screw. 29 is a load engaging member at In eitherconstruction there are ears 40 projecting from the base at the'sidethereof opposite the motor.l 41 is a pin through these .ears which in'the arrangementshown in Figures and 8 also passes through spool 42through which is a hole the center of which is the same diameter as thatof the pin, but which flares outwardly toward both ends. A threaded lug43 lprojects from 4the spool, into which is screwed the end of thepositioning and con-trol handle 44.

Between the ears 40 and the ends of the spool is a frame 45 ofinsulating material on which are mounted four4 movable contacts 46 andfour cooperating stationary contacts 47. The handle may be used toposition the jack, 4and maybe moved upy and down about the pin 41without effecting the electrical connection, but when it is moved to.one side or the other as indicated by the arrows A and B in Figure 8,it will rock the spool-against one or the other pair of the movablecontacts to'start the motor roi tating in one 'direction or the other ina way which will be fully described hereinafter.

Another arrangement for the positioning and-control lever 44 is shownvinFigures 9 and in which the pin 41 passes through a bracket 5() ofinsulating material on which are four stationary contacts 51. On the endof the handle 44 is a rocker 52'on which are themovable contacts 53. Inthis case the contacts are opened and closed by rotating .the handle 44as indicated by the arrows C and D in Figure 9.

The lifting screw is hollow and within it is a fiat strip 6() which istwisted near its ends as at 61, 62. A washer-63 affixed to the lower endof the screw 26 has a slotin it through which the strip 60 passes. Atthe lower end of the strip is a spring 64 which connects it with a cam65. This is arranged to be rotated between two pivoted spring pressedcontacts 66, 67 which are adapted to engagea stationary contact 68.

Now by referring to the wiring diagram, I will describe the operation ofthis device. The handle 44 is pivoted to the baseA of the jack So thatthe jack may be pushed or pulled into desired position without beingtipped over. Then the handle may be manipulated to actuate the contactsThese are a-rran ed toclose the motor circuit as follows: -us assumethat the jack 'is in its lowermost position and it is desired to raiseit. The contacts shown at the right of Figure 12 'from battery 7()through a conductor 71,

through the motor armature 72, to and through contacts 73 and 74, vtoand through the motor fields 75 and 76, to the stationary contact '68 ofthe automatic stop switch,

through'the pivoted, contact 67,c'ontacts 77 78 and conductor 79 back tothe battery.

As soon as the screw has been lifted a little the washer 63 on thebottom of it will turn the strip and cam 65 to allow' pivoted contact 66to close against stationary contact 6,8. This will have no eliect uponthe circuits because the conductor which isfmove the screw downwardlyand this moveetl are moved to be closed so that current passes.

matic stop switch contacts 66, 68 and that the current passes throughthe motor fields 76, 75 in the opposite direction to that which it didbefore. This will cause the motor. tov

70 ment will eventually cause the pivoted contact 66 to be moved olffrom the stationary contact 68 to ston the motor at the end of thedownward movement of the lifting` SI'OV.

It is of course to be understood that the contacts 73, 74, 77, 78 and81-84 of the wiring diagram correspond with those designated by 46, 47in Figures 7 and 8, and those designated by 51, 53 in Figures 9' and 10.

While I have described this invention as applied to light portablejacks, it is in no way limited to such use as the same principles areequally of the heaviest form. The 'modifications' illust-rated anddescribed are merely illustrative, and .I do not intend tolimit myselfto any specific form or mechanism, and in fact, I intend no limitationsother than those imposed by'the appended claims.

Vhat I claim is:

1. A lifting jack comprising a pair of relativelymovable members, anelectric m0- tor connected to impart such relative movement thereto,circuits for 'the motor andl a positioning handle lconnected with one ofsaid members and, arranged to control the motor circuits.

2. A lifting jack comprising a pair of relatively movable members, anelectric motor connected to impart such relative movement thereto,circuits for the motor and a positioning handle connected with one ofsaid members and arranged to control the motor circuits, and a switchinthe motor circuits actuated by the relative movement of said membersarranged to stop the motorautomatically at the ends of Said movement.

`3. A lifting jack comprising an outer casing a lifting screw, anelectric motor'and intermediate mechanism between the motor and thescrew for causing the rotation of the motor to move the screwlongitudinally, circuits for the motor and a positioning'115 handleconnected with-said outer casing and arranged to control the motorcircuit.

'4. A lifting jack comprising an outer'casmg a lifting-screw, an'electric motor and intermediate mechanism, comprising worm gearlng,.between the .motor and the Screw for causing t-he rotation of the motorto Amove the screw longitudinally, circuits for the motor, andapositioning handle pivotally connected with said outer casing 'near 125the lower part thereof, and arranged to control the motor circuit. y

5. A lifting jack comprising an outer casing, a lifting screw, anelectric motor and intermediate mechanism between the motor applicableto lifting jacks 85I and the screw for causing the rotation of the motorto move the Screw longitudinally, circuits for the motor, and alpositioning handle connected with said outer casing arranged to controlthe motor circuits, and a switch in said motor circuits and meansactuated by the longitudinal movement of the lifting screw for actuatingthe switch to stop the motor automatically at the ends of the movementof the screw.

6. A lifting jack comprising an outer caslng, axlifting screw, anelectric motor and intermediate mechanism, comprising worm gearing,between the motor and the screw for 'causing the rotation of the motorto move the screw longitudinally, circuits for the motor, and apositioning `handle pivotally connected with said outer casing near thelower part thereof arranged to control the motorcircuits, and a switchwithin said casing and in saidmotor circuits and means actuated by screwfor actuating the switch to stop the motor automaticallyat the ends ofthe movement ofthe screw.

7. A lifting jackcomprising an outer cas.- ing and a relatively movablemember, a inotor rigidly mounted with the outer casing and arranged toimpart said relative movement to said member, a positioning and controlhandle m/vably connected with the castor rigidly mounted with the outercasing and arranged to impart said relative movement to said member, aVpositioning and control handle movably connected with the casing, meansactuated by the movement of the handle relative to the casing forcontrolling the motor, and means actuated by the movement of said memberrelative to the casing arranged to stop the motor automatically at theends of said movement. the longitudinal movement of the liftingA InWitness whereof, I have hereunto set my hand this 11th day of July,1919.

JOSEPH A. ANGLADA.

